<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script>document.createElement("myHero")</script>
    <style>
    myHero{
        display: block;
        background-color: #ddd;
        padding: 50px;
        font-size: 30px;
    }
    </style>
</head>
<body>
    <h1> My First Heading</h1>
    <p>My First paragraph.</p>
    <myHero>My First Hero</myHero>
</body>
</html>